GameFAQs has at least one good FAQ describing all the things that were added in International + Last Mission, including the abilities for the new dresspheres.
I'm gonna feel pretty ripped off if game companies keep selling games but then releasing "special" versions with a lot of extra material, later down the line. Seems like a cheap gimmick, really - they can rush a game and release an unfinished product to people who'll buy it, then later decide to finish the job, and make people pay for a whole extra copy of the game if they want to enjoy the extras.
I seriously would not mind if they at least released the special versions in the States.